Update test-related gems
Add auxiliary rspec gems
Infer spec type
be_true -> be_truthy
ensure_inclusion_of -> validate_inclusion_of
Convert specs to RSpec 2.99.2 syntax with Transpec

This conversion is done by Transpec 2.3.7 with the following command:
    transpec spec

* 25 conversions
    from: it { should ... }
      to: it { is_expected.to ... }

* 19 conversions
    from: obj.should
      to: expect(obj).to

* 14 conversions
    from: Klass.any_instance.stub(:message)
      to: allow_any_instance_of(Klass).to receive(:message)

* 14 conversions
    from: obj.stub(:message)
      to: allow(obj).to receive(:message)

* 8 conversions
    from: describe 'some model' { }
      to: describe 'some model', :type => :model { }

* 7 conversions
    from: describe 'some controller' { }
      to: describe 'some controller', :type => :controller { }

* 3 conversions
    from: pending 'is an example' { }
      to: skip 'is an example' { }

* 2 conversions
    from: == expected
      to: eq(expected)

* 2 conversions
    from: describe 'some helper' { }
      to: describe 'some helper', :type => :helper { }

* 2 conversions
    from: describe 'some mailer' { }
      to: describe 'some mailer', :type => :mailer { }

* 2 conversions
    from: describe 'some view' { }
      to: describe 'some view', :type => :view { }

* 2 conversions
    from: it { should_not ... }
      to: it { is_expected.not_to ... }

* 2 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 2 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

* 1 conversion
    from: Klass.any_instance.should_not_receive(:message)
      to: expect_any_instance_of(Klass).not_to receive(:message)

* 1 conversion
    from: describe 'some request' { }
      to: describe 'some request', :type => :request { }

* 1 conversion
    from: describe 'some routing' { }
      to: describe 'some routing', :type => :routing { }

For more details: https://github.com/yujinakayama/transpec#supported-conversions
Upgrade to RSpec 3.1
Automatically require spec/spec_helper
Merge branch 'rspec-3'